import java.math.BigInteger;
import java.util.Scanner;

public class Main {

    public static void main(String[] args)
    {
        Scanner in=new Scanner(System.in);
        BigInteger a=in.nextBigInteger();
        String s=in.next();
        BigInteger b=in.nextBigInteger();
        if (s.charAt(0)=='+')
            System.out.println(a.add(b));
        else
            System.out.println(a.multiply(b));

    }
}